ASA 111

Passive Audio Summing Adapter with Stereo Mini Plug Input and Unbalanced Output
Key Features
  • Converts unbalanced stereo audio to unbalanced mono audio
  • Resistor network provides passive audio summing
The Extron ASA 111
Model Version Description Part #
ASA 111 Stereo Mini Plug Input 60-738-01

The Extron ASA 111 Audio Summing Adapter is a convenient, single-cable solution for combining two-channel stereo audio into a mono audio signal. It is ideal for summing stereo signals for use in mono PA systems in churches, halls, arenas, stadiums, and other environments where stereo signals would result in cancellation. Because it is a small and passive device, the ASA 111 is especially useful in systems where power and space are limited.

The ASA 111 includes a male 3.5 mm stereo mini plug connector for unbalanced stereo input signals and a captive screw connector for unbalanced mono audio output. It is designed as a 2 foot long adapter with a resistor network to properly sum stereo signals without signal loss or damage to source equipment.

Features

Specifications

ASA 111, ASA 121, ASA 131, ASA 141
Audio
   Gain 
      ASA 111, ASA 121 See the table below.  Tested with an unbalanced output and a 20k ohm load.
      ASA 131 See the table below.  Tested with a balanced output and a 20k ohm load.
       
      ASA 141 See the table below.  Tested with a 20k ohm output load.  Gain numbers are ±2 dB.
       
   Frequency response 
      ASA 111, ASA 121, ASA 131
       20 Hz to 20 kHz, ±0.05 dB
      ASA 141 with -10 dBV, +4 dBu, or +15 dBV input
       20 Hz to 20 kHz, -3 dB to +1 dB
   THD + Noise 
      ASA 111, ASA 121, ASA 131
       0.03% @ 20 Hz to 20 kHz at nominal level
      ASA 141 
         -10 dBV input 0.05%, 1 kHz, 1% from 40 Hz to 20 kHz
         +4 dBu input 0.05%, 1 kHz, 1% from 50 Hz to 20 kHz
         +15 dBV input 0.05%, 1 kHz, 1% from 80 Hz to 20 kHz
   S/N 130 dB at maximum output
Audio input
   Number/signal type 
      ASA 111, ASA 121, ASA 141
       1 stereo, unbalanced
      ASA 131 1 stereo, balanced
   Connectors 
      ASA 111 (1) 3.5 mm male stereo mini plug (tip-ring-sleeve)
      ASA 121, ASA 141 1 pair of male RCA (tip-ring)
      ASA 131 (1) 3.5 mm captive screw connector, 5-pole
   Impedance 
      ASA 111, ASA 121 22k ohms (with a 20k ohm unbalanced load, one input terminated);
4k ohms (with a 20k ohm unbalanced load, both inputs terminated)
      ASA 131 24k ohms (with a 20k ohm balanced load, one input terminated);
7k ohms (with a 20k ohm balanced load, both inputs terminated)
      ASA 141 5.4k ohms (with a 20k ohm balanced load, both inputs terminated)
   Nominal level 
      ASA 111, ASA 121 -10 dBV (316 mVrms)
      ASA 131 +4 dBu (1.23 Vrms)
      ASA 141 -10 dBV (316 mVrms) or +4 dBu (1.23 Vrms)
   Maximum level 
      ASA 111, ASA 121, ASA 131
       +24 dBu (12.3 V)
      ASA 141 +15 dBV (5.6 V)
    NOTE     0 dBu = 0.775 Vrms, 0 dBV = 1 Vrms, 0 dBV ≈ 2 dBu
Audio output
   Number/signal type 
      ASA 111, ASA 121 1 mono, unbalanced
      ASA 131 1 mono, balanced
      ASA 141 1 transformer, mono, balanced/unbalanced
   Connectors (1) 3.5 mm direct insertion captive screw connector, 3 pole
   Impedance (with 50 ohm input impedance)
      ASA 111, ASA 121 1k ohms unbalanced
      ASA 131 2k ohms balanced
      ASA 141 3.3k ohms balanced (typical)
   Nominal level 
      ASA 111, ASA 121 -10 dBV (316 mV)
      ASA 131 +4 dBu (1.23 V)
      ASA 141 -10 dBV (316 mV) or +4 dBu (1.23 V)
   Maximum level 
      ASA 111, ASA 121 +24 dBu (12.3 V)
      ASA 131 +24 dBu (12.3 V)
      ASA 141 +15 dBV (5.6 V)
General
   Power Not powered
   Temperature/humidity Storage: -40 to +158 °F (-40 to +70 °C) / 10% to 90%, noncondensing
Operating: +32 to +122 °F (0 to +50 °C) / 10% to 90%, noncondensing
   Rack mount Can be attached to any flat surface with supplied Velcro®.
   Enclosure type Molded plastic
   Enclosure dimensions 
      ASA 111, ASA 121, ASA 131
       0.7" H x 0.7" W x 1.3" D
(1.8 cm H x 1.7 cm W x 3.4 cm D)
(Depth excludes the 24 inches long pigtail for ASA 121 and the 24 inches long single cable for the ASA 111 and ASA 131.)
      ASA 141 1.1" H x 1.1" W x 1.6" D
(2.8 cm H x 2.8 cm W x 4.0 cm D)
(Depth excludes the 24 inches long pigtail.)
   Product weight 0.2 lbs (0.1 kg)
   Shipping weight 1 lb (1 kg)
   Vibration ISTA 1A in carton (International Safe Transit Association)
   Listings UL, CUL
   Compliances CE, FCC Class A, VCCI, AS/NZS, ICES
   Product warranty 3 years parts and labor
    NOTE     All nominal levels are at ±10%.
    NOTE     Specifications are subject to change without notice.
(7.51-083006-D3)
Shipping Dimensions and Weights
    Part # Height Width Depth Weight
    60-738-01 0.75" (1.9 cm) 6.0" (15.2 cm) 11.0" (27.9 cm) 0.11 lbs (0.05 kg)

Diagram

Application Diagram

Panel Drawing

Panel Drawing
© 2019 Extron. Specifications are subject to change without notice.